Journal ArticleDOI
Morphology of y’ and y” precipitates and thermal stability of inconel 718 type alloys
R. Cozar,André Pineau +1 more
- Vol. 4, Iss: 1, pp 47-59
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In this article, the precipitation microstructure varies rapidly with aging temperature and composition, and the influence of composition and aging temperature on the conditions that bring about this compact morphology has been investigated.Abstract:
The precipitation of the γ’ (Ll2) and γ" (DO22) phases has been studied in four alloys Fe-Ni-Cr-Ti-Al-Nb containing a higher Ti + Al/Nb ratio than that of the INCONEL 718 alloy. For these alloys, the precipitation microstructure varies rapidly with aging temperature and composition. Bct γ"particles have always been found to precipitate on γ’ phase. Moreover, by aging three alloys above a critical temperature, a “compact ntorphology” has been observed: cube-shaped γ’ particles coated on their six faces with a shell of γ" precipitate. This microstructure has proved to be very stable on prolonged aging. A thermal stability better than that encountered in nominal INCONEL 718 alloy can thus be achieved. The influence of composition and aging temperature on the conditions that bring about this “compact morphology” has been investigated. A minimal Ti + Al/Nb ratio between 0.9 and 1 has been determined, allowing the “compact morphology” to be obtained.read more
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Journal ArticleDOI
Cascading of the as-built microstructure through heat treatment and its role on the tensile properties of laser powder bed fused Inconel 718
R. Jayaraj,Punit Kumar,Hang Li Seet,Sharon Mui Ling Nai,Pei Wang,Upadrasta Ramamurty,Upadrasta Ramamurty +6 more
TL;DR: The microstructures and mechanical properties of the Ni-based superalloy, Inconel 718 (IN718), which was additively manufactured using the laser beam powder bed fusion (LB-PBF) technique in the as-built (AB) and heat treated (HT) conditions were investigated, with emphasis on the microstructural evolution from the AB to HT conditions and, in turn, on the tensile properties as mentioned in this paper.
Journal ArticleDOI
Phase discrimination between δ and η phases in the new nickel-based superalloy VDM Alloy 780 using EBSD
TL;DR: In this article, an advanced dictionary-based approach that involves the simulation of dynamic electron scattering events identified η phase as the main component of these grain boundary precipitates, consistent with the recently published HRTEM investigation on VDM Alloy 780.
Journal ArticleDOI
Comparison of deformation induced precipitation behaviour in Alloy 718 under two microstructural conditions
TL;DR: In this article, a comparison of the evolved microstructure of deformed and undeformed specimens that have been subjected to similar thermal history, deformation induced precipitation could be identified.
Journal ArticleDOI
Cascading of the as-built microstructure through heat treatment and its role on the tensile properties of laser powder bed fused Inconel 718
TL;DR: In this article , the microstructures and mechanical properties of the Ni-based superalloy, Inconel 718 (IN718), which was additively manufactured using the laser beam powder bed fusion (LB-PBF) technique in the as-built (AB) and heat treated (HT) conditions were investigated, with emphasis on microstructural evolution from the AB to HT conditions and, in turn, on the tensile properties.
Journal ArticleDOI
Yielding behavior of a γy-precipitation strengthened Co Ni Cr Nb Fe alloy
M.C. Chaturvedi,D. W. Chung +1 more
TL;DR: In this paper, the yielding behavior of a 35 Co, 35 Ni, 15 Cr, 12 Nb, 3 Fe alloy, strengthened by an ordered bct γ phase has been studied.
References
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Journal ArticleDOI
The Determination of the Elastic Field of an Ellipsoidal Inclusion, and Related Problems
TL;DR: In this paper, it is shown that to answer several questions of physical or engineering interest, it is necessary to know only the relatively simple elastic field inside the ellipsoid.
Journal ArticleDOI
Déformations de cohérence d'un précipité quadratique
TL;DR: In this paper, exact expressions for the elastic field due to a perfectly coherent precipitate having the form of a rectangular parallelepiped, the material being supposed elastically homogeneous and isotropic.
Journal ArticleDOI
The microstructure of 706, a new Fe−Ni-base superalloy
TL;DR: In this article, the phase relationships of Alloy 706 alloy were investigated and it was shown that on the basis of chemistry and micro-structural response, Alloy 606 alloy can be considered to be intermediate to the well-known alloys, 718 and 901.
Journal ArticleDOI
Heterogeneous precipitation of metastable γ′-ni3ti in a nickelbase alloy
TL;DR: In this article, the effect of prior deformation on the precipitation of L12 γ′-Ni3Ti in nickel-base Alloy 901 was investigated by thin foil microscopy.
Journal ArticleDOI
Fine Faults and Crystal Structures of Precipitates in Fe-Mo and Fe-W Alloys
Kōhei Yagisawa,Hiroshi Fujita +1 more
TL;DR: In this paper, the crystal structure and two-dimensional faults of the precipitates in Fe-Mo alloys were investigated using electron microscopic method, and the faults were found on {00.1}hex, {10.0}hex and {100}hex planes.